linux-kernel - Re: [PATCH 2/2] netfilter: add missing macro

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Date:	Mon, 11 Jul 2016 12:41:10 +0200
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Eric Engestrom <eric.engestrom@...tec.com>
Cc:	linux-kernel@...r.kernel.org, Eric Engestrom <eric@...estrom.ch>,
	Patrick McHardy <kaber@...sh.net>,
	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
	netfilter-devel@...r.kernel.org, coreteam@...filter.org
Subject: Re: [PATCH 2/2] netfilter: add missing macro

On Fri, Jul 08, 2016 at 05:29:11PM +0100, Eric Engestrom wrote:
> Signed-off-by: Eric Engestrom <eric.engestrom@...tec.com>
> ---
> 
> This can't compile without this macro… Is this header really used by anyone?
> Should it be removed, to avoid bit-rot?

Probably better to define something like:

#define SCTP_BITMAP_LEN         (256 / sizeof (u_int32_t))

and use it consistently all around the code, so we can get rid of
these ARRAY_SIZE() from the uapi header.

> ---
>  include/uapi/linux/netfilter/xt_sctp.h | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/include/uapi/linux/netfilter/xt_sctp.h b/include/uapi/linux/netfilter/xt_sctp.h
> index 58ffcfb..e4410db 100644
> --- a/include/uapi/linux/netfilter/xt_sctp.h
> +++ b/include/uapi/linux/netfilter/xt_sctp.h
> @@ -3,6 +3,8 @@
>  
>  #include <linux/types.h>
>  
> +#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof(arr)[0])
> +
>  #define XT_SCTP_SRC_PORTS	        0x01
>  #define XT_SCTP_DEST_PORTS	        0x02
>  #define XT_SCTP_CHUNK_TYPES		0x04
> -- 
> 2.9.0
>